<!DOCTYPE html SYSTEM "http://www.thymeleaf.org/dtd/xhtml1-strict-thymeleaf-spring4-4.dtd">
<html lang="en"  xmlns:th="http://www.thymeleaf.org">
<head>
    <meta charset="UTF-8"/>
    <title>Title</title>
</head>
<body>
<h1 th:text="${showtext}"></h1>
<h1 th:utext="${showtext}"></h1>

<span th:if="${19>20}">
    为假
</span>
<span th:unless="${19>20}">
    为真
</span>
<img src="image/1.jpg">
<img th:src="@{image/2.jpg}">
<a href="http://bizhi.ziyuandi.cn/">链接</a>
</body>
</html>